Jag XKR-S GT vs SRT Viper TA

542bhp Brit brawls with 631bhp of American muscle. But which will come out on top?

But there's no clear, instant signal to the driver that the Jaguar has the spurs to cut it on the track. The lighter-than-air steering of the original car is still there, there's no real sense of extra urge over the RS and the suspension feels controlled but not in any way racy.

There is no such perception problem in the Viper Time Attack. It feels like it was raised on a strict diet of tyre smoke and brake dust, as, even though it has all the latest Viper upgrades, it still feels like it was born to ride the red and white kerbs. The steering is sharper, bodyroll non-existent and the engine unburstable.